Watts AERCO Benchmark BMK5000 Operation And Service Manual page 49

Benchmark Platinum-Edge [ii]: Operation-Service Manual
SECTION 4 – INITIAL START-UP
PROPANE Combustion Calibration Instructions
11. The main Manual Combustion Calibration screen appears. It provides two methods to
ramp the unit's valve position up or down:
•
Method 1: Toggle through the pre-set calibration points till you reach the desired
valve position, then press Go to go to that point (left image below).
•
Method 2: Enable Fine VP Step, then manually press the + or – buttons once per
1% to bring the unit to the desired valve position (right image below).
PRE-SET CALIBRATION CONTROLS
Figure 4-9: Manual Combustion Calibration Screens
12. Set the Controller's Enable/Disable switch to Enable.
13. Change the valve position to 30%, press the Go button, then verify that the unit has ignited
successfully and is operating as expected.
14. Use the  (Right) arrow key to change the valve position to 100%, then press Go.
15. Verify that the gas pressure on the downstream side of the SSOV is within the required
range shown in Table 4-4. If it isn't, remove the brass hex nut on the SSOV actuator to
access the gas pressure adjustment screw (Figure 4-3). Adjust using a flat-tip screwdriver,
slowly rotating the gas pressure adjustment (in 1/4-turn increments) clockwise to increase
gas pressure or counterclockwise to reduce it. The resulting gas pressure reading on the
downstream manometer should fall in the range listed below.
TABLE 4-4: PROPANE Gas Pressure Range @ 100% Fire Rate
Model
BMK750P
BMK1000P
BMK750DF
BMK1000DF
1500DF & 1500P
2000DF & 2000P
2500DF & 2500P
3000DF & 3000P
4000DF & 4000P
5000NDF & 5000NP
5000DF & 5000P
6000DF & 6000P
NOTE 2: For BMK750 Dual Fuel, measure Propane Gas Manifold Pressure at 85% Fire
Rate. Range shall be 1.8" +/- 0.1" W.C. (0.45 kPa ± 0.02 kPa)
OMM-0137_J •
12/20/2022
Nominal Gas Pressure
3.9" W.C. ± 0.2" W.C. (0.97 kPa ± 0.05 kPa)
6.3" W.C. ± 0.2" W.C. (1.58 kPa ± 0.05 kPa)
See NOTE 2
1.8" W.C. ± 0.1" W.C. (0.45 kPa ± 0.02 kPa)
1.4" W.C. ± 0.1" W.C. (0.35 kPa ± 0.02 kPa)
2.5" W.C. ± 0.1" W.C. (0.62 kPa ± 0.02 kPa)
2.0" W.C. ± 0.1" W.C. (0.50 kPa ± 0.02 kPa)
1.6" W.C. ± 0.1" W.C. (0.40 kPa ± 0.02 kPa)
1.5" W.C. ± 0.1" W.C. (1.12 kPa ± 0.02 kPa)
1.5" W.C. ± 0.1" W.C. (1.12 kPa ± 0.02 kPa)
2.0" ± 0.2" W.C. (0.50 to 0.05 kPa)
4.2" ± 0.2" W.C. (1.05 to 0.05 kPa)
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
VALVE POSITION CONTROLS
Page 49 of 167